facebook1 youtube1 twitter1 instagram linkedin1 pinterest1

NOTICE:  If you are not a free registered member of the site, you will not see the photos in the forum, and you won't be able to access our premium member content. Please consider joining our community! REGISTER AND MAKE THIS BOX DISAPPEAR!

×

Picture Attachment problem (09 Jul 2022)

Due to the extraordinary growth of the membership and resources, we are once again bumping up against hosting limits. I am working on a fix. In the meantime, the forum should function, but you won’t be able to attach images. Working as fast s we can to fix. Thanks for your patience. - Makotosun

Split the case and some metal balls fell out, where do they go?

  • Sherka
  • Sherka's Avatar Topic Author
  • Offline
  • Senior Member
  • Senior Member
  • Posts: 44
  • Likes received: 20
Hey there, I recently picked up a '74 DT125 with a crunchy bottom end. Ripped it all apart, took photos of everything but when splitting the cases I had 2 metal balls fall to the ground, no clue where they came from and where I should put them back. Any advice is greatly appreciated!
  
Last edit: 13 Nov 2022 09:20 by Enduronut.
12 Nov 2022 21:07 #1

This message has attachments images.
Please log in or register to see it.

Please Log in or Create an account to join the conversation.

  • Posts: 703
  • Likes received: 378
Greetings from Tennessee. #18 is to your clutch rod and #12 to your neutral switch it should also have a spring
The following user(s) Liked this Post: Enduronut, MarkT, Sherka
12 Nov 2022 21:41 #2

This message has attachments images.
Please log in or register to see it.

Please Log in or Create an account to join the conversation.

  • Posts: 8864
  • Likes received: 3419
Where did the two short pins come from in your pic. Look like are from the selector drum if you've removed the end plate. Otherwise the way they're sitting with the ball i was starting to wonder if someone had made a clutch pushrod in two pieces & added a ball between. Your neutral detent ball & spring i can still see the cap in the case so remove that & fit it last after assembling the center cases. Ideally that should have been removed with spring & ball before the center cases are parted--must be a spring there somewhere or still in the cap. Should be a ball between the long pushrod & a short mushroom rod.
The following user(s) Liked this Post: Ht1kid
13 Nov 2022 01:52 #3

Please Log in or Create an account to join the conversation.

  • Posts: 732
  • Likes received: 444
My first thought was you said crunchy bottom end so check your crank bearings to see if they came apart or any other bearing for that matter. Main axle bearing? I'd be replacing all the bearings anyway. Good luck!
1978 DT400E
1976 DT400C
1973 RT3
1971 RT1B
1968 DT1 (Project)
The following user(s) Liked this Post: Enduronut
13 Nov 2022 08:54 #4

Please Log in or Create an account to join the conversation.

  • Sherka
  • Sherka's Avatar Topic Author
  • Offline
  • Senior Member
  • Senior Member
  • Posts: 44
  • Likes received: 20
Yes they are from the selector, thanks for the heads up on removing it before I split the cases my first time ever doing this and was following some guy from Taiwan on youtube haha. I found the spring at the bottom of the case.

Thank you @Ht1kid for the diagram and information, major help. The bearings are all intact, in amazing condition actually, just one of the crank bearings is oddly extremely rusted and crunchy.
13 Nov 2022 09:48 #5

Please Log in or Create an account to join the conversation.

  • Posts: 8864
  • Likes received: 3419
heres a partzilla link to all pages just incase it helps. model changed design in 74 but looks like old design as think electric start retained the old cases. we had both kick & electric in NZ, but anyway, goodluck. ps, those pins didn't need to come out but hope you've saved all of them. there's one short one too but that won't fall out as has a tiny circlip.
www.partzilla.com/catalog/yamaha/motorcycle/1974/dt125a
The following user(s) Liked this Post: Sherka
13 Nov 2022 18:32 #6

Please Log in or Create an account to join the conversation.

  • Sherka
  • Sherka's Avatar Topic Author
  • Offline
  • Senior Member
  • Senior Member
  • Posts: 44
  • Likes received: 20
Hey there, back with another question. Well 2 actually. 

I've searched online and in the service manual yet cant find any info on how to take the crank itself apart to replace the lower end bearing on it.  imgur.com/a/WSE63vY  I can't seem to post photos today so there's a link to it. I'm assuming I just punch the center out or do i need to have it pressed out or is there another way that I don't know about and cant find?

Also I'm having trouble getting that bolt out of the armature that I used to press it off of the crank. I was reading after the fact to taper the threads and make it easier to get out but its STUCK on there now... any recommendations? 
15 Nov 2022 10:38 #7

Please Log in or Create an account to join the conversation.

  • Posts: 8864
  • Likes received: 3419
I'd guess the end of the bolt has flared from working hard to pull the armature off the taper. Probably can't do much now except force it back. Otherwise can you cut the head off the bolt then put armature in the lathe & machine the bolt stem down to below thread size the wind it through & out the far end. Never had to do it but i'm full of smart arse ideas the usually don't work lol.
The following user(s) Liked this Post: Sherka
Last edit: 15 Nov 2022 12:24 by RT325.
15 Nov 2022 12:16 #8

Please Log in or Create an account to join the conversation.

  • Posts: 8864
  • Likes received: 3419
With the crank, you're getting into specialized territory there but sounds like you're keen to get right into it. Here's a random video that should be good to watch.
The following user(s) Liked this Post: AirborneSilva, msavitt, Sherka
15 Nov 2022 12:22 #9

Please Log in or Create an account to join the conversation.

  • Sherka
  • Sherka's Avatar Topic Author
  • Offline
  • Senior Member
  • Senior Member
  • Posts: 44
  • Likes received: 20
Thank you for the link to that video! I feel like I'm a bit over my head in this but that's cause I've never done it before. I don't have a press to get that pin out with... or the money for one. Might just got to a shop and see if they can get it out or maybe see if there is a hydraulic press on my campus I could bum. As for the armature I'll google a bit more to see if I can find anything, will keep everyone updated!
The following user(s) Liked this Post: Sneezles61
15 Nov 2022 14:42 #10

Please Log in or Create an account to join the conversation.

Moderators: yamadminEnduronutMakotosunDEETVinnieDevinJames Hart